Alright, let's work through 76755801 times 77100000 step by step
76755801 × 77100000 = 77100000 × (76755801)
+ 77100000 × 1 giving us 77100000
+ 77100000 × 00 what gives us 0
+ 77100000 × 800 yielding 61680000000
+ 77100000 × 5000 yielding 385500000000
+ 77100000 × 50000 what gives us 3855000000000
+ 77100000 × 700000 giving us 53970000000000
+ 77100000 × 6000000 yielding 462600000000000
+ 77100000 × 70000000 that results in 5397000000000000

= 5917872257100000
